Jig for boring connecting rods



Nov. 3, 1931. A. STORM ET AL 1,830,724

JLG FOR BORING CONNECTING RODS Filed June 14, 1928 4 Sheets-Sheet 1 a j" j Jug.

N0v.3,1931. A ASTORM ETAL 1,830,724

JIG FOR BORING CONNECTING RODS Filed June 14, 1928 4 Sheets-Sheet 2 l ll ,E 7^ l 78 73 L 4y w 2279 3 29 L l 20 fl ,0 72 2/ jfl@ 5 fjjvwii@ doo @57077111 K Wai" V7/201001? J5 y Ze@ Nov. 3, 1931. A. STORM ET AL 1,830,724

AJLG FOR BORING GONNECTING RoDs Fiied June 14, 192B 4 sheets-sheer s /Uzgjf (s2, -E y .99

gaat e Nov. 3, 1931. A. STORM-'ET AL JIG FOR BORING CONNECTING RODS Filed June 14, 1928 4 Sheets-Sheet 4 noun s'ronir ANDTHon THQRSEN, or^x I y Y y ING., or .ii/LINNEAPOLIs;I MINNESOTA, A couronnf fmffimshiriiiie Crankshaft bearing.

Patented Nov. 3, 1931 sronivr 'MANFncrUnING eej; -wrowiormrrrs'o'w MrNNEAPoLIs, MINNESOTA, AssIGNoRs 'ro grenen poRING; .COlilxine'rINGr nousv i Applicaties. RQJUIw 1.4.,

V Qur present invention hasfor its .obj the. provisionr of a. relatively Isimple highly eliicientjig forwholding and lgnifngfpiston vassenyihlie's` and.foroeiiteringjthecrank shaft :p'bearing of the connectingy rod off'a piston assel'nhly and for centering'and holding 'a' tool c' Fig. 15 is an elevation of the screw feed Iritli'e'. accompanying'diavvings, Which il`-v lustrafe inventionijlike characters indi#v catelile part-s throii'ghoilt vthe vsevera-Ll,views. 15

Referring tothe drawings 't' n Figfl isa ysideelevation. of theJ Jig and la l .piston assembly mguniegdihreiif;

L nigga is a plagviewpifgthe Sam@ f Fig. 3 isa fragmentary' -detail view prin- Fig. 4 is..'a transverse sectiontalrensuh partly in longitudinal;vertical@ y Fig. Gis avievsi partlyk'l L g partly in 't'r'ansv'erse.n i verticaly seotionj taken onthe line6--6 ofFig.`2; f y Fig. 7 l is7 a fragmentary udetail View With some. p artsfri` i 'bar mi Seite# faajherefor;

. Fie yS is .e i. esmetarrdetail. View with th boring. barsetind'o. theilne Sef Fig. 6; y

Fig. 9 is aperspective viewpf the anchor- .ing plate;

Fig. 10 `is a.. view-.partly in elevation vand i .partly in seetiontaken on the line..10-.10 of Fig.6; f

Fig. 11 is a -viewlcorresponding to Fig. 6

fjorlthe boring bar; v 1

A Fig. 12 a View. partly in elevation andl i partly in transverse' 'vertical geen@ taken on 'the line1'2Q-12 ofFigf2j" 7 Fs.- L13 is ,a .fragmenten ,detail viewpartly in, wenn.,@d5-parure.generieke on spiny in. Seien .faken cn @eline ef 2, on anenlarged scale; 4tuted therefor.'

1nV elevation and Y central longitiidinalsection. .1 showing `the connecting hetfvveen ytghejooring.

lissie. s'evriai No. eesoe.

scale; f

Fig. lit' is a fragmentary view partly in "transverse Vertical seo'tionand partly in eleremoved from its bearing and boring har;

' Fig. i6 is anelevation of the nut block for oombin'ations ofzfdevicesf. hereinafter de 'the feed screw, said feed screw being sec- Y.'

' ,tfoned on the'line 1616`of Figil x f ",lis a fragmentary detail view prineipallyy Vin section showing the "boring bar adj .ted for' illeting thefbushing;

- F;'g. l8 is va View corresponding. tov Fig. 17 butfshowing 'the boring baradjusted for therline 13d-13 of Fig. 2, on an enlarged AfiIiShing the louterfaoes of the bushing; and l `f Fig. 19 Ais a vievvcorres'ponding to Fig. 6

i vvith theboring har and feed screw removed and a'. mandrel and centering conessuhsti* y 'Ihejais'ton assemblyl illustrated in the 4stantially on theirregular line l-.fllfof Fig. 2;' f1draw1ngs v includes a piston Aj, connecting rod Figg isa vieivfpartlyinsidefelevation and'` B, Wr1.'st pin C; split'jbabbitted bushing'D in ,the two-part connecting! rod bearing E on 4 said .Connecting rod. The -Wrist pinjC is ff rigidly held in theconnecting rod B in the 'customary manner and is turnably mounted in the bearings therefor inthe piston A and it is mportantto note that the length of the -i vvlst pin C is'lessthan that of the diameter `ofthepiston"'A.'

VReferring now in detail to the invention f the numeral 20 indicates a casthed having three 'short supporting legs 2l'in which are formed vertical holes adapted to receive loolts7 not shown, for frigidlysecuring the jig to a bench or other support. Integrally Aformed with the'hed 20 near one end thereofis a Way 22 comprising av pair of longitudinally eX- tended and laterallyspaced guides,l theop-l posing faces of* WhichV are in upwardly dimilled to afford supporting surfaces vfor hold- .ing-the piston Awith'its axis extending parallel to saidv bedfatk vthe 'transverse center c thereof. V Y

. The Vpiston A is rigidly held in a horizontal position on` the Way 22 by a pairof laterally Sreeeljrertcal arms 23 which proieCtl Urbut Showmg another 'type O thegfefedgscrewz verging re a ion transveisely of said ed and ly of the bed 20. This shaft 24 is rigidlyy Vheld in a frame 25 attached to the under side ward through apertures in the bed and open intermediate notches in the outer faces of the way 22. Said arms 23 at their lower ends are pivoted on a transverse lower shaft 24 for vertical swinging movement transversely of the bed 20 and for lateral adjustment toward and from each other transverseof the bed 20 by means of a horizontal hinge bolt 26 for vertical swinging movement, longitudinally of said bed. A coiled spring 27 encircling the hinge bolt 26 with one of its ends engaging the bed 2O as a base of resistance and its other end engaging the spring 27 is under tension to lift said frame toward the bed and raise the arms 23. .f

To swing the frame downward against the tension of the spring 27 and thereby lower the arms 23 a'wedge block 28 is inserted between the bed 2O and shaft 24 for movement longitudinally of the bed 20. This wedge block 28 engages the bed 2O as a base of resistance with its oblique face transversely engaging the shaft 24. Said wedge block 28 may beeither projected or retracted by a hand-wh'eel-equipped screw rod 28 swiveled to said wedge block and having screw-threaded engagement with the bed 20.

On the opposing faces of the arms 23 is a pair of axially aligned anchoring studs 30 which extend into the outer end portions of Y the wrist pin seats in the piston A and hold [iii said piston on the way 22 with the axis of the f wrist pin C parallel to the bed 20. Y These anchoring studs 30, as shown, are in the form of heads on nut-equipped bolts 31 removably mounted in leither one oftwo pairs of upper and lower holesl 32 in the arms 23. A pair of handles 33 by whichthe arms 23 may be manipulated are secured to said arms at their intermediate portions and which handles are axially aligned and project laterally out! ward from said arms. n

Obviously, by adjusting the screw rod 29 to force the wedge block 28 between the head 20 andshaft 24, the arms 23 will be drawn downward by the movement of the frame 25 and rigidly hold the piston A on the way 22 with the axes of said piston and wrist pin in a plane parallel to the bed 20.

The purpose of mounting the arms 23 on the shaft 24 for lateral adjustment in respect to each other and for mounting the anchoring studs 36 on the arms 23 for longitudinal adjustment is to hold pistons of different diameters on the way 22. In case the piston to be aligned on the way 22 is providedwith a wrist pin, the ends of which vare flushvor substantially flush with the periphery of the piston anchoring studs adapted to enter the/tubular wrist pin may be substituted for the anchoring studs 30. l/Vith the piston A properly aligned and rigidly held as above described,

the connecting rod B is tested for bend or torque.

For the purpose of this case it is not thought necessary to show the gauge that is applicable to the jig and the co-operating the gauge and arbor are removed from the bushing D and sai-d bushing held centered, as will hereinafter appear.

A carriage 34 is mounted on the bed 2O for sliding movement longitudinally toward and fromthe way 22 and has on its under sideat its longitudinal edge portions a pair'of longitudinally extended shoes 35 that slidably rest on a pair of low flat rails 36 and 37, respectively, integrally formed with thetop of the bed 20. Also integrally formed with the bed 2O at the outer longitudinal edge portion of the rail 37 is an upstanding guide flange 39 with which the .outer edge portion of thel shoe 35 slid'ablycontacts to hold the carriage for straight-line sliding'inovement.

To hold the shoe 35 on itsV rail 37 and against the guide flange 39, an. oblique way 40 is formed on the lower. edge portion of said flange outwardjof the bed 2O and .on which way a ball-bearing 41 rests for longitudinal travellingvmovement. vThis bearing 41 is mounted in a cage 42 rigidly secured to an oblique retaining bar 43 at substantially the longitudinal centerithereof. Said retainingbar 43 is rigidly secured by screws to the carriage 34, extends under the way40 and parallel thereto with just1 sufficient clearance so that only the ball-bearing 4l is in contact withsaid way. Integrally formed with the pending flange 45 which overlaps the respective side of the bed 2O outward of therail 38 and is space'doutward thereof.

An L-shaped retaining bolt 46 has its body portion looselymounted in a vertical hole in if l a boss 47 on the outer face of the flange 45 at substantiallyl the longitudinal center thereof. The lower or horizontal portion of the bolt 46 lies in agroove 48 formed in the lower end of the boss 47v and which. groove holds the bolt '-f A? 46 from turning about its longitudinal axis. A thumb nut49` is applied to the upper screwe threaded end of the bolt 46. i

The arrangement of the groove 47 is such that the horizontal portion Vof' the'bolt 46 c carriage 34 is a longitudinally extended dei ne.

,to lockthe carriage 34fto the .bed 2() different vdistances froxnlthe .Ways 22, to adjust the jig i ufor connecting rods ofldiiferentlengths.

A pair of thumb screws 50) have screw# :threaded .engagement with ar-etaining bar 43, one near each end thereof and Vpositioned when. tightened; to impinge .againstl the way .as to thefadjustment ofsaid carriage toward nndffrom said piston.

A pair of laterally spaced upstanding bear- 4ings ..51 and 52 are integrally formed withthe longitudinal edge portions of the carriage 34 and the seats therein are axiallyaligned. .The

vaxes of these bearings 51 and 52 areparallel to the axes of thewrist pin B and to the bed 20. VFormedin the bearing 51is anopen notch-like ltool. passage 53,'for a purpose that `will presently appear.

For centering the connecting rod B with the axis of. its bushing D axially aligned with y theaxes of the seats in thebearings 51rand L52 there is provideda, mandrel 54 han/'ing` a diameterless than that ofisaid sea-ts and on which mandrel is loosely mounted a pairot .truncatedk centering cones 55, the bosses of which are turned outward, see Fig. 19. f

Formed with one end of the mandrel 54 is a nurled hand-,piece 56V and adjacent thereto is a circnmferentially-expanded portion''.. y The .otheror outer end of the-mandrel 54 is mounted in a bushing 58 Y.removably tted in thebearing 52. `The Opposing end por- 4tions oflthelcentering cones 55have formed `therein 4a plurality. of circumferentially spaced notches 59-so arranged that thev re-V ;spectiveends of said cones Vmay be moved into mesh V`with'each other so that` the base portions'ofsaid cones maybe brought rel` Cativcly close togetherfor centering connect- Aing rod crank shaft bearings ofwrelatively large'diameters. Y

Qbviously, y by `mounting the mandrel l,as shown in Fig.v 19, wherein .itfetends through fthel bushing QD with- Athe centering cones 5,5 extending into the ends thereosaid bushing will be accurately held in trne Vaxial alignment with said mandrel. lVitlr the bushing D thus centered and held, a system 4vof clamps areprovided for rigidlysecuring the connecting" rodB'to thecarriage"y 34 lso that-the mandrel 54 and centering conesf155 i `may be removedfrom the bushing D `and bearings 51A and 52 and said bashing turned to true cylindrical ornrandV otherwise finished to a ycrank on a crank shaft to, which itis to be applied. This. system ofi clamps includes xa'aclamp ,60; comprising apair. of` snbstan'tiallyparallel vertically .extended members@ 6-1 Aand, 62,;,the

, lower end., portions of which afford .apair of cofoperatingrjaws `(lz'md. 64. jThese `-clamp members l6l and 62 arey intermediately, connected by a hand screw 65 4and Varei'nrther connectidat` Atheir: @upper ends by ahand screw .66. The hand screw 65. `has,screw-threaded .engagement .withltheclamp member Y61 and .looselyextends through a passage in the, pasi'f .sagetherefor inthe clamp member62jand the :head ofsaid screw impingesl against the outer rface ottheclamping member 62 as a base ,of

resistance. The hand screw'66hasscrewthreaded 4engagement .with the clamping member 62;and its .innerY end impinges against the. innerfaceof the clamping member 6l.

a .lntegrallyformed with the inner face of the jaw 63 is a V-shaped contact point 67 and longitudinally extended fser'rations 6&3y Yare Vformed. in the inner face of the jaw 64 to lincreaseits gripping action. In applyingjthe lclamp 6() to the connecting rod B thesame isgposltioned, asbest shownin Fig. 12, with thejaws `63.and 641extending3one on leach side .of said connecting rod. gIt'will be noted that the connectingfrodB is I-shaped in cross section'and that the clampl 60 has a two-point contact with the respective side of the con.y nectingrod B and thatthefjawr is outv of contact withfsaid, rod'k and that its point 67 impinges against the web of said connecting rod on the-'oppositeside.thereof from the jaw 64 and Amid-,way between'itscontact with y' said connecting ro and 6 2-.is apair. of reversely andoutwardly extended substantially axially aligned Atrunnions.-y 68 that extend substantiallyV parallel tothe axis of the `1nandrel=54 with the contact Formed with thel clamping ...members 6ll Y i point 67 therebetween.. vApplied to each trunnion'68 is a C-clamp 69 having aV-.sha-ped .seat TOin -which said trunnion rests and also having 4a binding yscrew 7l that impinges `against vsaid trunnionand 'holdsit in vsaid seat. The C-clamps 69 are rigidly ,and adjustably secured to `an anchoring plate 72 which,l in turn, is ri idly and adj ustablysecured tothe bed 20V etween'thebearings 51 land 52 v by Vbolts which `extend throughlongitudinally extended slots in said plates and have threaded engagement with the carriage.

VSaid anchor plate 72 has at its sides upstanding bearing 'flanges and the C-clamps -69 overlap the bearingflanges 73 `and have` lon- )gitudin all-y exten ded .slots 7 4.

lheC-.clamps 69 ,are adj ustably and rigidly secured to the bearing flanges 75:3, by binding-screws 7 5 Whichzextend loosely through izo the slots vr74-and have screw-threaded engagei i ment with saidbearirigH anges,` see Figli-3.

lVVashe'rs 7 6 on thescrewsf are` interposed between lthedouter facesofthevC-clamp 169 .-andhoulders L on; the binding iscrews 75 `and `havegball 'and socket contact with said bind- `will automatically adjust themselves to each other and to the parts on which they are mounted without placing any strani on the *connecting rod B whatsoever, that would tend vto move it out of its position as centered by the cones 55.

A vertically adjustable abutment 78 on which the connecting rod B rests, see Fig. 12. is mounted on the anchoring Aplate 72. This abutment 78 is in the form of a stem to the intermediate portion of which is selcured a nurled operating vwheel 79 and the lower end portion of said abutment has screwthreaded engagementwith a boss 80 integrally formed with theanchoring plate 72. This abutment 78 is adjusted into engagement with the under side -of the connecting rod B before the centering cones are removed from the bushing D to prevent the connecting rod B from being accidentally moved vertically downward between the clamp members 61 and 62.1

Tith the connecting rod B rigidly held by the system of clamps and abutment just described, the mandrel 54 and centering cones are removed leaving the bushing D positioned and rigidly held for boring and finishing. as will hereinafter appear. The attachnient for boring the bushing D to the correct diameter and for Aotherwise finishing said bushing includes a boring bar 81 of such diameter as to snugly fit in the bearings 51 and 52 with freedom for rotary movement and en dwise feeding movement.

This boring bar 81 has an intermediate transversely ektended tool seat 82 and a radiall),y extended set screw 83 adaptedv to be positioned. in said'seat to support and radially project a cutting tool mounted in said seat. For clamping a tool in the cutter bar, rod 84 is mounted in the tubular outer end portion of the boring bar 81, has screwthreaded i engagement Vtherewith and arranged to impnge against a tool in the seat 82 and rigidly hold the same. On the outer end of the screw rod 84 is a head in which is secured a transversely extended pin 85 by which said rod may be rotated. Y

1n Fig. 14 isa tool 86 mounted lin the boring bar 81 for boring the bushing D to the desired diameter. A tool 87 vis shown in Fig. 17 for filletingthe bushing D and a tool 88 isshown in Fig. 18 for finishing the ends of said bushing. Rigidly secure'dto the outer end of the boring bar 81 is a fly wheel 89 provided with a hand-piece 90 by which the boring'bar" 81'may be Vrotated'to operate the cutting tool mounted therein. In the rear end of the boring bar 81 is an axially extended cylindrical socket 91 into which a lock pin 92 anchored to the boring bar feed for the boring bar 81 and Figs. 6 and 7 show a hand feed therefor. Said automatic feed includes` a screw-threaded rod 93 having unthreaded end portions, either one of which is adapted to be inserted into the socket i A91 and provided with a bayonet slot 94 adapt ed to receive the lock pin 92 and detachably secure the feed screw 93 to the boring bar 81.

A split nut block 95 is applied to the feed screw 93 vand provided with a screw 96 for contracting said nut at its split portion and frictionally clamping the same onto the feed screw 93. The nut block 95V is removably mounted betweenl the prongs of a fork 97 on an arm 98 integrally formed with the carriage vand which nut block is held from turning by said fork so that the feed screw 93 maybe rotated therein and it is also held by said fork against axial movement so as to impart an endwise travelling movement to the feed screw 93 when rotated in the nut block 95. Open notches 99 are formed in the prongs of the fork 97 for the feed screw 93 to permit said nut block to be removed from the fork withoot detaching the same from the feed screw 93.

The hand feedfor the boring bar81 includes a long screwsthreaded rod 100 to the outer end of which isapplied a hand wheel 101 by which said feed screw 100 maybe turned. The inner end of the feed screw 100 1s unthreaded and provided with an annular groove 102. An adapter 103 is provided for Vattaching the feed screw 100 to the boring bar 101. This adapter 103 has a cylindrical stem 104 arranged to be inserted into the socket 101 on the boring bar 81 and provided with a bayonet slot 105 arranged to receive the lock pin 92 and detachably secure the feed screw 100 to the boring bar 81.

`The inner end of the feed screw 100 is mounted in a socket 106 in the outer end of the adapter 103 for axial turning movement and is held swivelled thereto and against removal therefrom by a pin 107v anchored to the adapter 103 and extending int-o the groove 102, see Fig. 7. l

A nut block 108 is applied to the feed screw 100 and adapted to be held in a fork 97 in the-same manner that the nut block 95 is held, thus making the automatic feed screw 93 and the hand feed screw 100 interchangeably usable. The nut Yblock 108 may be frictionally clamped onto the feed screw 100 with sufficient friction so that the feed screw 100 will remain stationary during the rotation of the STI boring bar 81 and thereby hold the boring bar 81 against axial movement. This holding of the feed screwV stationary is highly important to prevent axial movement of the feed screw 100 when the finishing tools 87 and 88 are being used, for illeting or finishing the ends of the bushing D.

What we claim is l. In a jig for aligning and holding piston assemblies, a bed, means for securing the piston of an assembly in respect to the carriage, a carriage mounted on the bed, bearings on the carriage, means applicable to the bear- Y ings for centering the crank shaft bearing of the connecting rod of the piston assembly in respect thereto, adjustable means for securing the connecting rod to the carriage including a clamp having a'pair of jaws that have transverse three-point contact with the connecting rod, said jaws having a pair of trunnions, a pair of C-clamps applied to the trunnions for compound axial and circumferential adjustment thereon, binding screws eX- tending through longitudinal slots in the C-clamp and having threaded engagement with the carriage, said seat clamps being selfadjustable on the binding screws and securable in their self adjusted positions, and an adjustable abutment on the carriage for supporting the connecting rod, said bearings being adapted to center and hold a tool for finishing said crank shaft bearing.V

2. In a jig for aligning and holding a piston assembly, a bed having a piston aligning way, means for securing the piston of an assembly in the way, a pair of axially spaced bearings, means applicable to the bearings for centering the crank shaft bearing of the assembly in respect thereto, and means for rigidly holding the connecting rod of the assembly in respect to the bearings including a clamp having a pair of jaws applicable to the connecting rod, each provided with a trunnion and multiple jointed connections from each trunnion to one ofthe bearings and having means for rendering the same rigid, certain of said joints being in the form of clamps adjustably applied to the trunnions.

3. In a jig for aligning and holding a piston assembly, a bed having a piston aligning way, means for securing the piston of an assembly in the way, a pair of axially spaced bearings, means applicable to the bearings for centering the crank shaft bearing of the assembly in respect thereto, and means for rigidly holding the connecting rod of the assembly in respect to the bearings including a clamp having a pair of jaws, each jaw being similarly provided with a trunnion and a multiple jointed connection from each trunnion to a part on the bed, each connection having means for rendering the same rigid, one of the joints in each connection being tures.

, ADOLPH STORM. THOR THORSEN. 

